An efficient and high-yielding one-pot synthesis of 4-acyl-1,2,3-triazoles via triisopropylsilyl-protected ynones
摘要:
A practical and efficient process has been developed for the synthesis of 1-substituted 4-acyl-1H-1,2,3-triazoles using a three-step one-pot synthetic approach. This transformation involves an initial preparation of triisopropylsilyl (TIPS)-protected ynones from acid chlorides and TIPS-acetylene, followed by a AgF-mediated TIPS deprotection and Cu-catalyzed Huisgen cycloaddition. The increased chemical stability of TIPS-protected ynones was an important factor in the high overall product yield. (C) 2011 Elsevier Ltd. All rights reserved.
A copper-catalyzed three-component reaction of methyl ketones, organic azides, and various one-carbon (C1) donors was developed that provides 4-acyl-1,2,3-triazoles in moderate to good yields. While DMF, DMA, TMEDA, or DMSO can serve as the C1 donor, best yields were obtained using DMF. The transformation is proposed to proceed via an oxidative C–H/C–H cross-dehydrogenative coupling followed by an
The metal-free, high selectivity and efficient synthesis of 4-acyl triazoles in a DES (ChCl:ethylene glycol) is reported.
报道了在DES(ChCl:乙二醇)中无金属、高选择性和高效合成4-酰基三唑的方法。
One-Pot Three-Step Synthesis of 1,2,3-Triazoles by Copper-Catalyzed Cycloaddition of Azides with Alkynes formed by a Sonogashira Cross-Coupling and Desilylation
作者:Frédéric Friscourt、Geert-Jan Boons
DOI:10.1021/ol1022036
日期:2010.11.5
A microwave-assisted, one-pot, three-step Sonogashira cross-coupling-desilylation-cycloaddition sequence was developed for the convenient preparation of 1,4-disubstituted 1,2,3-triazoles starting from a range of halides, acyl chlorides, ethynyltrimethylsilane, and azides.
An efficient and high-yielding one-pot synthesis of 4-acyl-1,2,3-triazoles via triisopropylsilyl-protected ynones
作者:Soonho Hwang、Hoon Bae、Sumin Kim、Sanghee Kim
DOI:10.1016/j.tet.2011.12.025
日期:2012.2
A practical and efficient process has been developed for the synthesis of 1-substituted 4-acyl-1H-1,2,3-triazoles using a three-step one-pot synthetic approach. This transformation involves an initial preparation of triisopropylsilyl (TIPS)-protected ynones from acid chlorides and TIPS-acetylene, followed by a AgF-mediated TIPS deprotection and Cu-catalyzed Huisgen cycloaddition. The increased chemical stability of TIPS-protected ynones was an important factor in the high overall product yield. (C) 2011 Elsevier Ltd. All rights reserved.